Section 2: Opeu. Response 30. In an investigation, students performed the following steps and made some
observations:
1. The students poured fresh water into a beaker and added a few drops of a
chemical solution called bromthymol blue. The water in the beaker turned blue
2. One student blew through a straw into the water in
the beaker. The water in the beaker turned yellow
3. The students then placed some waterweed (a plant)
into the water
in the beaker and placed the beaker
under a bright light
4. After a short period of time, the students observed
the beaker. The water had turned blue again and
there were bubbles on the waterweed leaves.
The setup of this investigation is shown.
a. The water changed from blue to yellow when the student blew into it (step 2). Identify
the compound that caused the water to change from blue to yellow.
b. Explain why the water turned blue again when the beaker with the waterweed was
under the bright light (step 4). In your explanation, identify the process that caused
this change.
c. Explain why there were bubbles on the waterweed leaves (step 4).
that caused the changes in step 4. You may

How are the cell walls of a plant and fungus different ?

In tossing one coin 10 times, what are your chances for tossing a head? a tail? 2. in tossing one coin 100 times, what are your chances for tossing a head? a tail? 3. in tossing one coin 200 times, what are your chances for tossing a head? a tail? deviation = ((absolute value of the difference between expected heads and observed heads) + (absolute value of the difference between expected tails and observed tails)) divided by total number of tosses. this value should always be positive. 4. what is the deviation for 10 tosses? 5. what is the deviation for the 100 tosses? 6. what is the deviation for 200 tosses? 7. how does increasing the total number of coin tosses from 10 to 100 affect the deviation? 8. how does increasing the total number of tosses from 100 to 200 affect the deviation? 9. what two important probability principles were established in this exercise? 10. the percent of occurrence is the obtained results divided by the total tosses and multiplied by 100%. toss the coins 100 times and record your results. calculate the percent occurrence for each combination. percent head-head occurrence: percent tail-tail occurrence: percent head-tail occurrence:

How are proteins and nucleic acids related? they both provide energy. they both carry genetic information. the structure of proteins is determined by nucleic acids. the subunits of nucleic acids are also the subunits of proteins.